The name Amber is synonymous with the English word "amber", referring to the orange-yellow gemstone formed from fossilised tree sap or resin. The word itself comes from the Arabic word anbar (عنبر). It has been used as a given name since the late 19th century and came into use with many other gemstone names, such as Opal, Beryl, and Ruby. It peaked in popularity in the late 20th century and has been declining since.